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32995251533
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United
3,096,183
‘ fettcnf
atented July 2, 1963
2
1
sary to ensure a homogeneous distribution of the additives
in the synthetic plastic material.
3,096,183
BACTERIA-RESISTANT PLASTIC MATERIALS
The synthetic plastic materials with bacteria~repellent
Hermann Genth, Krefeld-Bockum, Germany, assignor to
Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, 5 lgQif’?gg'gigg?gégiiftoag] 2132332152231:c‘: ?lmzvgigszg
Germany, a corporation of Germany
No Drawing. Filed Feb. 26, 1960, Ser. No. 11,124
Claims priority, application Germany Mar. 12, 1959
4 Claims. (Cl. 106-15)
outstanding effect against a large variety of microorgan
isms, particularly microorganisms causing suppuration,
_
microorganisms causing putrefaction and mold fungi, is
I, desired, such as for example, for the produtcion of foot
mats, hand grips, handles and doors, seating in vehicles,
The present invention is concerned with bacteria-‘re 10‘ duckboards
or trenchboards for swimming pools, wall
sistant synthetic plastic substances or materials possessing
coverings in hospitals and arti?cial leather~ covers for
bacteria-repellent properties, the said plastic materials be
,
ing suitable for the production of shaped, molded, pressed, ’ equipment used for carrying patients.
The
durability
of
the
microbicidal
action
of
the
syn
or formed articles or bodies by known methods.
I‘. is known to bestow bacteria-repellent properties to 15 thetic plastic materials according to the invention is
notable, even in the case of continuous handling of objects
synthetic plastic materials by the addition of microbicidal
made
therefrom with the usual washing and cleaning
materials, such as, for example, the propyl ester of p
agents.
hydroxybenzoic acid (Propylparaben U.S.P.) and, organic
mercury compounds.
The agents previously used for
this purpose, such as, for example, the propyl ester of p
hydroxybenzoic acid have, to a certain extent, the disad
vantage that, even when used in high concentrations, they
The following example is given for the purpose of
20 illustrating the present invention:
only inhibit the growth of microorganisms but do not‘kill,
being merely bacteriostatic rather than bactericidal in this
~
A mixture of 2.5 parts by weight of zinc pentachloro
phenolate'and 2.5 parts by weight of salicyl anilide is
stirred with 22 parts by weight of dioctyl phthalate and
73 parts by ‘weight of polyvinyl chloride. The mixture
Other agents, such as the above-mentioned or- 25 obtained in this manner is rolled into foils at a roller
temperature of 160-l65° C. Apart from an enhanced ef
ganic mercury compounds, which have a strong bacterio
respect.
static effect and, furthermore, have a lethal e?ect upon
many microorganims, are objectionable because of their
very high toxicity to warm-blooded animals and humans.
We have now found that zinc pgntachlorophenplgtc is
suitable to an outstanding degree for bestowing bacteria-_ '
feet against gram-negative microorganisms (Escherichia
and Salmonella types), the foil has inhibiting and lethal
effects against Staphylococcus aureus, Bacterium cremoris,
Eberthella typhi, Bacillus subtilis, Streptococcus lactis,
Escherichia 0011', Candida a‘lbicans, Aspergillus niger, Tri
chophyton pedis,y Penicillium glaucum, and Chaetomium
globosum. Furthermore, it is characterized by a better
inhibiting properties upon synthetic plastics, such as, e.g.,
polyvinyl chloride, copolymers of vinyl chloride and
> stability against discoloration by ‘light than a similar poly
vinyl acetate and copolymers of vinyl chloride and acryl
vinyl chloride material containing no salicyl anilide but
35
onitrile, polyethylene,‘ polypropylene, polystyrene, unsat
twice as much zinc pentachlorophenolate.
nrated polyesters and cellulose esters, e.-g., cellulose aceto
I claim:
butyi'ate. Zinc pent‘acEloropEenolate not only has a lethal
letiectro'n‘bacteria and mold fungi but also on the very
1. A bacteria-resistant synthetic plastic material com
' posed of a synthetiiglastic substance of the group con
widely distributed fungi such as Trichophyton pedis and 40 sisting of polyvinyl loride,@po~lymers of vinylchloride
Candida alihicanst
9
and vinyl acetate copolymers of vinylchlo'fi'de and acry
The eliect of the zinc pentachlorophenolate can be in
lonitrile,
polyethylene, polypropylene, poly-styrene, un
creased by the addition of salicyl anilide (Z-phenylar'nino
saturated polyesters and cellulose esters containin _be
carbonylphenol). By means of thisaddition, it is possible
for the zinc pentachlorophenolate, which by itself isonly _ tween about 1 and about 5% by weight oLanmixture
lethally active against gram-negative bacteria, such as a of approximately equal arts by weight of zinLrsnta
E?lhTéhh'Er?lKfE’E?d salicyl anilide incorporated in the
Escherichia c011‘, at high concentrations, to kill those bac
teria even at low concentrations. Furthermore, the addi
tion of salicyl anilide has the additional advantage sub
stantially to suppress the tendency of the zinc pentachloro- '
phenolate to bring about a de?nite discoloration of the
.
synthetic plastic material.
,
The concentrations of the zinc pentachlorophenolate
'“s'aid’plastic'materialf _—-"
.
2. A bacteria-resistant synthetic plastic material com
posed of a synthetic plastic substance of'the group con
sisting of polyvinyl chloride, copolymers of vinyl chloride
and vinyl acetate, copolymers of vinyl‘ chloride and acry
lonitrile, polyethylene, polypropylene, polystyrene, un
and salicyl anilide can fall within wide limits and depend
only upon the nature of the synthetic plastic material and 5
saturated polyesters and cellulose esters, a plasticizenfor
the said resin, and between about 1 and about 6% by
its intended use. As a rule, concentrations of about 1
to about 6 percent, calculated on the total weight of the
weight of .zine-peptgdiltlggphgpolate and salicyl anilide
weightmixture of approximately equal parts by
?nal synthetic plastic material, su?‘ice.
incorporated in the said plastic materi?.
The incorporation of the zinc pentachlorophenolate and
of the salicyl anilide into the synthetic plastic material
sentially of a synthetic plastic material as de?ned in
can be carried out in the usual manner employed for the
incorporation of additives such as pigments, plasticizers
3. A molded article formed of a material consisting es
claim 1.
4._ A molded article formed of a material consisting es~
sentially of a synthetic plastic material as de?ned in
and catalysts. In the case of the use of plasticizers, it
claim 2.
is frequently of particular advantage to add the micro
bicidal additive to the Qgilgejplas?c material dissolved 35
References Cited in the ?le of this patent
or disper =-- = .- -. i =
r which may be, for examp e,
aryl sulfonates of higher aliphatic hydrocarbons, dimethyl
UNITED STATES PATENTS
phthalate, diethyl phthalate, dibutyl phthalate, dicyclo
2,292,423
hexyl phthalate, sdioctyl phthalate, tricresyl phosphate,
triphenyl phoshate, dibutyl adipate, benzyl butyl adipate, 70 2,439,395
2,457,025
aliphatic sulphonic acid esters, triglycol acetate and octyl
2,567,905
p-hydroxybenzoate. ln,all cases, it is, of course, neces
Yohe ________________ __ Aug. 11, 1942
Leatherman __________ _. Apr. 13, 1948
Benignus _____________ _- Dec. 21, 1948
Field ______________ _..__ Sep. 11, 1951
ii